That.
But it could very well be the Earth equivalent (human origin world) in the Star Wars galaxy.
EDIT: Also, the believed potential lore (it isn't confirmed, but proposed as potentially the situation in game), is that Tatooine was the origin world of humans, but in a war with the Rakata and the Infinite Empire, it was turned into a desert. Many of the humans were enslaved and dislocated, and who were left evolved into Sand People.